Sealed transmitter assembly for subsurface utility installations

A radio frequency transmitter assembly for disposition in a subsurface utility enclosure, the assembly comprising:

• a circuit board supporting radio frequency transmitter circuitry, the circuit board having at least two orthogonal edges;
• an antenna having two antenna extension portions extending from the two orthogonal edges of the circuit board, the antenna extension portions having two respective portions bent at approximately ninety degrees from the plane of the circuit board to provide a compact lateral area for the assembly without increasing a height of the assembly;
• a housing for enclosing the circuit board and the antenna, wherein the housing has a barrier separating a battery compartment underneath the circuit board from an antenna compartment which is adjacent the circuit board and which contains the two respective portions of the antenna bent at ninety degrees from the plane of the circuit board;
• wherein a gap is formed between one edge of the circuit board and an interior wall of the housing;
• wherein the housing has a top cover for closing the housing;
• an antenna compartment cover that is enclosed within the housing, that is separate from housing top cover and that is disposed over the antenna compartment;
• and
• a flowable material for sealing around the antenna compartment cover and an exposed top side of the circuit board, said flowable material filling in the battery compartment through the gap between one edge of the circuit board and an interior wall of the housing to seal a bottom side of the circuit board and to protect against moisture entering the battery compartment, wherein the antenna compartment cover prevents the flowable material from entering the antenna compartment.